PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-05:27:50
G01     72.6           33.1                1.4 +/-    1.13       2.3 +/-    1.13  0.040 / 0.030
G07     136.5          32.1                6.0 +/-    1.17      10.0 +/-    1.17  0.030 / 0.040
G11     55.5           32.1                1.8 +/-    1.47       3.0 +/-    1.47  0.070 / 0.180
G13     278.0          37.2                3.1 +/-    1.27       4.7 +/-    1.27  0.080 / 0.210
G15     303.4          15.4                0.9 +/-    0.86       2.1 +/-    0.86  0.030 / 0.030
G17     231.3          68.4                5.1 +/-    0.52       5.4 +/-    0.52  0.030 / 0.030
G19     223.2          41.8                5.8 +/-    2.24       8.2 +/-    2.24  0.060 / 0.060
G28     18.2           59.4                3.4 +/-    1.25       3.9 +/-    1.25  0.040 / 0.060
G30     133.3          61.2                5.1 +/-    0.39       5.8 +/-    0.39  0.080 / 0.090